The final results were "the closest in Iowa
Democratic caucus history," the IDP statement said.

Neither Clinton nor Sanders declared victory in Iowa on Monday
night, but both hailed their caucus performances as successes.

Both the former secretary of state and the US senator from
Vermont delivered fiery speeches as results continued to show
them in a dead heat.

By 11:30 p.m. CT, Clinton had 49.8% of the vote and Sanders had
49.6%, according to the IDP.

During her speech, Clinton said she was "breathing a big sigh of
relief," and she shouted, "Thank you Iowa!" as she addressed a
crowd of supporters about an hour earlier.

Sanders spoke afterward and said that "while the results are
still not complete," it looked like a "virtual tie."

"What Iowa has begun tonight is a political revolution," he said.

The Democratic race plunged into further chaos early Tuesday
morning, when the Sanders campaign told reporters, according to multiple reports, that the Iowa Democratic Party
informed both campaigns that results from about 90 of the state's
more than 1,600 precincts were "missing."

Both candidates addressed their opponent during their speeches.

"I want to take this opportunity to congratulate Secretary
Clinton and her organization for waging a very vigorous
campaign," Sanders said.

He opened his speech on a victorious note, to thunderous applause
and loud cheers, that remembered the large deficit at which he
began the race.

"Nine months ago, we came to this beautiful state, we had no
political organization. We had no money. We had no name
recognition, and we were taking on the most powerful political
organization in the United States of America," he said, in a
reference to Clinton.

Throughout his remarks, he blasted "billionaires" who "buy
elections" and noted that small donations had propelled his
campaign.

"I am overwhelmed and I am moved by the fact that millions of
people throughout this country have helped volunteer on our
campaign, that we have received in this campaign 3.5 million
individual contributions," Sanders said.

"People who went to BernieSanders.com, and you know what the
average contribution was: It was $27!" he thundered.

REUTERS/Adrees Latif

By contrast, Clinton has relied more on larger donations.

"We do not represent the interests of the billionaire class or
Wall Street … and I am very proud to tell you that we are the
only candidate on the Democratic side without a super PAC,"
Sanders continued. "And the reason that we have done so well here
in Iowa, the reason I believe we are going to do so well in New
Hampshire … The reason is the American people are saying no to a
rigged economy."

As Sanders was speaking, he was interrupted several times by
cheers, and at one point the crowd started shouting his name,
drowning out his speech.

Clinton's event was more subdued. But it, too, had a victorious
tone, as Clinton fired up the crowd with a passionate speech
about the race ahead.

She congratulated her "esteemed friends and opponents" and said
she was "excited about really getting into the debate with Sen.
Sanders about the best way forward to fight for us and America."

"It is rare that we have the opportunity that we do now," Clinton
said. "To have a real contest of ideas. To really think hard
about what the Democratic Party stands for and what we want the
future of our country to look like if we do our part to build
it."

She then called herself a "progressive" who "gets things done for
people."